Linde Star Sapphire
Contributed by: Chris Clemens
Date: Apr 16th, 2026
Locality: New York, USA (See on Mindat)
Size: 10 x 6 x 12 mm
Description:
In 1947, the Linde Air Products Company of New York began producing a form of synthetic gem corundum that was marketed in the gemstone industry as "Linde Star Sapphire." Also called Lindy stars, these laboratory-created gemstones were known for the perfection of their asterism, showing as a 6-pointed star under normal lighting. The Linde stars were sold as round and oval cabochons in various sizes and colors. Production of the Linde stars was discontinued in 1974 due to foreign competition. It shows intense, saturated, red fluorescence under longwave UV.
Originally posted by Chris Clemens on Nature's Rainbows in 2023.
Summary of luminescence responses:
Corundum var. Sapphire (Mindat) (RRUFF)
- Fluorescence under Longwave (365nm LED) UV light: Red